25mg. (11aR)-3,7-Bis((4-(1,1-dimethylethyl)phenyl)-10,11,12,13-tetrahydro-10,10,13,13-tetramethyl-5-hydroxy-diindeno[7,1-de:1',7'-fg][1,3,2]dioxaphosphocin, 98%, (99% ee). . Molecular Weight: 634.8. Molecular Formula: C41H47O4P. Color/form: off white to light yellow pwdr. Strem# 15-8578. http://www.strem.com/catalog/v/15-8578/